A)So the total of the flour overall is 100%.

20% was used to bake the cake, and 30% for cookies, so 20+30=50%.

To work out what percentage is left, we take away the used amount from the overall percentage, i.e. 100-50=50%.

B) A percentage is a number out of 100, e.g. 100%=100/100, 50%=50/100 etc.

So she used 30% of the flour to bake cookies: 30%=30/100.

Then we need to simplify this fraction:... more

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